Calibration of regional groundwater flow models: Working toward a better understanding of site‐specific systems
Calibration of regional groundwater flow models: Working toward a better understanding of site‐specific systems
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区域地下水流模型的校准：努力更好地了解特定地点的系统
DOI：
10.1029/2002wr001653
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发表时间：
2003
影响因子：
5.4
通讯作者：
P. Goblet
中科院分区：
文献类型：
--
作者：
M. Castro;P. Goblet
这项工作突出了缺乏独特的解决方案，区域地下水流模型和量化的自由度有关的水力传导率的模型校准测得的水头。4He作为一个独立的示踪剂在减少非唯一性问题的潜力进行了测试。四个不同的校准地下水流的情况下，在得克萨斯州的Carrizo含水层和周围的地层。结果表明，Carrizo含水层和上覆封闭层的导水率变化高达2个数量级，导致相似的计算水头。没有明确的论点来证明一种地下水流情景对另一种地下水流情景无效。与此相反，当测试与4He运输概念模型，所有的地下水流的情况下，除了一个未能重现连贯的4He运输行为在系统中。这项研究举例说明了4He未来在辨别哪种模型最接近复制自然条件方面可能做出的贡献。
This work highlights the lack of unique solutions for regional groundwater flow models and quantifies the degree of freedom concerning hydraulic conductivities for models calibrated on measured hydraulic heads. The potential of 4He as an independent tracer at reducing the nonuniqueness problem is tested. Four different calibrated groundwater flow scenarios are presented for the Carrizo aquifer and surrounding formations in Texas. It is shown that variations of hydraulic conductivities up to 2 orders of magnitude in the Carrizo aquifer and overlying confining layer lead to similar calculated hydraulic heads. No clear‐cut arguments are present to invalidate one groundwater flow scenario over a different one. In contrast, when tested with a 4He transport conceptual model, all groundwater flow scenarios except one failed to reproduce a coherent 4He transport behavior in the system. This study exemplifies possible future contributions of 4He at discerning which model most closely replicates natural conditions.